Finite element model updating for a cable–stayed bridge based on field measured data : dynamic properties and deformation and strain responses to truck loads and thermal loads | |
| Author | Kantarat Hoykaew |
| Call Number | AIT Thesis no.ST-23-05 |
| Subject(s) | Finite element method Rama IX bridge--Models Engineering models |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This thesis presents the development of accurate finite element models for the Rama 9 bridge, which has been in service for 35 years. The study aims to improve the models through two consecutive methods: manual tuning and sensitivity-based model updating based on field measured data. The field data includes dynamic properties, including natural frequencies and corresponding mode shapes, and deformations and strain responses to truck loads and thermal loads. The research encompasses essential data collection, finite element modeling, structural analyses, and calibration of the models using field test results. The study reveals the significance of additional masses, pre stressing force in cables, and foundation flexibility in both nonlinear static and modal analysis. After manual tuning, the finite element models demonstrate good agreement with the identified natural frequencies and mode shapes from ambient vibration measurements. Similarly, the predicted responses to truck loads and thermal loads show a close match with the field measurements. Through iterative model updating based on frequency and combined frequency and responses to truck loads, further improvements are achieved. The updated models better align the predicted natural frequencies with the measured values, with slight enhancements observed in the responses to truck and thermal loads. Some aspects, however, remain unchanged. The calibrated finite element models provide a reliable basis for future structural analysis and monitoring of the Rama 9 bridge. |
| Year | 2023 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai |
| Examination Committee(s) | Anwar, Naveed;Punchet Thammarak |
| Scholarship Donor(s) | Loom Nam Khong Pijai (Greater Mekong Subregion) Scholarships |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2023 |